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// Example 7.5.5 page 7.25
clc;
clear;
h=6.626d-34; //plank's constant
c=3d8; //speed of light
eta=70/100; //quantum efficiency
I=3d-6; //photocurrent
E=1.8d-19; //energy of photns
q=1.6d-19; //charge of electron
lamda=h*c/E; //computing wavelength
R=eta*q*lamda/(h*c); //computing responsivity
Popt=I/R; //computing optical power
lamda=lamda*10^6;
Popt=Popt*10^6;
printf("\nWavelength is %.2f micrometer.\nResponsivity is %.3f A/W.\nIncident optical power required is %.3f microWatt.",lamda,R,Popt);
//answer of Popt in the book is calculated as 4.823, deviation of 0.002
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